Method for the termination of anionic polymerization by Lewis acid
a technology of anionic polymerization and lewis acid, which is applied in the field of anionic polymerization termination by lewis acid, can solve the problems of product color retention and aging stability loss, and the antioxidants used for such purposes are not stable under a basic condition, and achieve the effect of enhancing the stability of the resulting polymer
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example 1
Termination of the Polymerization of Styrene-Butadiene Block Copolymer Using Triethyl Aluminum
[0033] A 2L reactor was charged with Argon gas. 900 g of cyclohexane, 0.2 ml of tetrahydrofuran, and 40 g of styrene were placed thereto. The reaction solution was heated to a temperature of 50° C. 2 mmol of n-butyl lithium(1.3M cyclohexane solution) of an initiator was added to the reaction solution. 10 min later after the temperature of the polymerization reached highest, 120 g of butadiene was added to the reaction solution. 5 min later after the temperature of the polymerization of butadiene reached highest, 2 mmol of triethyl aluminum was added to the reaction solution to remove reactive living polymers. Then an antioxidant was added. After the polymerization was completed, 5 g of styrene was additionally added to observe the degree of removing reactive living polymers. The solvent was removed by employing steam stripping from resulting polymer solution to obtain styrene-butadiene blo...
example 2
Termination of the Polymerization of Butadienes Using Triisobutyl Aluminum Hydride
[0034] A 2L reactor was charged with Argon gas. 900 g of cyclohexane, 0.2 ml of tetrahydrofuran, and 175 g of butadiene were placed thereto. The reaction solution was heated to a temperature of 50° C. 2 mmol of n-butyl lithium(1.3M cyclohexane solution) of an initiator was added to the reaction solution. 5 min later after the temperature of the polymerization reached highest, 2 mmol of trisobutyl aluminum hydride was added to the reaction solution to remove reactive living polymers. Then an antioxidant was added. After the polymerization was completed, 5 g of styrene was additionally added to observe the degree of removing reactive living polymers. The solvent was removed by employing steam stripping from the resulting polymer solution, roll milled and further dried to obtain polybutadiene.
example 3
Termination of the Polymerization of Butadiene Using Triethyl Borane
[0035] A 2L reactor was charged with Argon gas. 900 g of cyclohexane, 0.2 ml of tetrahydrofuran, and 175 g of butadiene were placed thereto. The reaction solution was heated to a temperature of 50° C. 2 mmol of n-butyl lithium(1.3M cyclohexane solution) of an initiator was added to the reaction solution. 5 min later after the temperature of the polymerization reached highest, 2 mmol of triethyl borane was added to the reaction solution to remove reactive living polymers. Then an antioxidant was added. After the polymerization was completed, 5 g of styrene was additionally added to observe the degree of removing reactive living polymers. The solvent was removed by employing steam stripping from the resulting polymer solution, roll milled and further dried to obtain polybutadiene.
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